<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>BOM操作</title>
</head>
<body>
    <button onclick="alert('警告框')">弹出警告框</button>
    <button onclick="confirm('确认框')">您确认要删除吗</button>
    <button onclick="prompt('输入框')">弹出输入框</button>
<script>
    console.log(parseInt(6.6));
    console.log(parseInt('hhh'));

    console.log(parseFloat('6.6'));
    console.log(isNaN('hhh'));
    console.log(isNaN(7.7));
</script>
</body>
</html>